I'm experiencing starting problems with a 2.8 MPI.  I have a donor car
from which I was going to rob the IAC motor, and upon inspection one of
the two screws holding it in had been snapped off at the screw head.
 Then I looked at the actual car I'm working on and it's the same exact
deal.
 So far, just the one screw apparently has been adequate to hold in the
IAC to do its job.  But I'm apprehensive about attempting to remove the
one remaining screw for fear of it snapping off as well and having BOTH
screws snapped off, a big hassle:  Would applying heat to the
surrounding aluminum likely allow it to be loosened?
   I know it's just electrolytic corrosion from the dissimilar metals.
Since both of my engines had the same thing, I'd expect to see this in
junkyard engines as well.
 As an aside, anyone know what else might make an '88 2.8 take up to 5
seconds of cranking before starting--then run perfectly normal after
that?  I usually have to give it a little gas before it will start, no
codes. TIA